Bulb-stenciling device.



0. WINSTON.

BULB STENCILING DEVICE. APPLICATION FILED use. 1. 1916.

Patented Mar. 5, 1918.

Q on BY H16 ATTOP/VEKT Over/on l V/ sf UNITED STATES PATENT carton,

A OVERTON -WINSTON. OF MINNEAPOLIS, MINNESOTA.

BULB-STENCILING DEVICE.

Specification of Letters Patent. P t t d 31 15, 191

Application filed December 1, 1916. Serial No. 134,284.

To all whom it may concern: I

Be it known that I, OVERTON. TVINsToN, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Bulb-Stenoiling Devices; and I do hereby declare the following to be a full, clear, and exact de scription of the invention, such as willfenable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to provide an extremely simple and highly efiicient stenciling device for use in applying a wax coating to the main bodyof an electric light bulb, and thereby preparing the same for the application of frosted surfaces thereto, by subsequently dipping the bulb into an acid or material which will not attack the wax but which will produce a frosting or ground surface effect on the exposed or uncovered zones of the bulb globe.

Generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

. The invention is illustrated in the accompanying drawings wherein like characters indicate like parts throughout the several views. Referring to the drawings;

Figure 1 is a view chiefly in side eleva tion but with some parts sectioned, showing the improved stenciling device and an electric light bulb held thereby; and

Fig. 2 is a section taken on the line 22 of Fig. 1.

This improved stenciling device comprises a suitable handle 3 having a curved extended bar or plate 4 to which one or more stencil blocks are applied. The device shown is intended for use in producing two distinct frosted zones on the globe of the light bulb,

and hence. the said bar 4 is provided with two so-called stencil blocks 5 and 6, both of which are formed with concave surfaces that closely fit the globe 7 of the light bulb. The shank of the light bulb is indicated by the numeral 8 and its tip by the numeral 9. The bulb, as shown, is of the two filament type being formed with an axial filament at and an offset filament b. The shank 8 is provided with the customary lock lugs 10. At its extended end, the bar 4: is provided with a semi-circular abutment 11 that engages the bulb globe just below and closely adjacent to its tip 9. A clamping lever 12 having an extended arm 13 is pivoted. to the shank of the bar 4 at 1 1. At'its free end, the'clamping arm 12 is formed with a transversely curved head 15 that fits and closely engages the shank S of the light bulb;

A'spring 16 attached to the shank of the bar t at one end, presses against the arm 13 at 1ts free end and yieldingly holds the head 15 of the arm 12 against the shankjof the light bulb. Two leaf spring'sl'? and-18 are anchored to the bar 1. The free end of the spring 17- is transversely 'roundedand engages the shank of the bulb in opposition to the head 15 of the arm 12. The spring 16 is of suilicient strength to overcome the spring 17, and hence, will force the globe of the bulb tightly against the stencil blocks 5 and 6. The free end of the spring 18 presses the outer end of the bulb shank 8 and forces the bulb against the abutment 11.

The bar 4 has a peek hole 19 through which the filaments of the bulb may be seen, thus enabling the bulb to be rotated on the axis of the shank until its filaments are properly positioned in respect to the stencil blocks 5 and 6. a

Then the bulb is held, as shown in Fig. 1, and is then dipped in paraffin, or other wax, all of the surface of the bulb except those portions covered by the stencil blocks 5 and 6, will be covered with wax, then when the bulb is removed from the stenciling device, and dipped in acid, or other liquidwhich, by its chemical'action on the glass, will produce the frosted zones, or which will otherwise produce a light dimming surface, the bulb will, of course, be provided with the frosted surface corresponding to the form of the so-called stencil blocks.

After the bulb has been frosted, the Wax may be readily removed by dipping the same in hot water. The spring 17 cooperates with the spring-pressed arm 12 to hold the bulb transversely centered, and it also rocks the bulb away from the stencil blocks 5 and 6 when it is first released therefrom, and without producing a scrapingactionbetween the which latter is engageable with the bulb I adjacent to its top, a spring-pressed clamping lever mounted on said handle and engageable with the shank of the bulb to hold the same seated against said stencil block, and a spring applied to the extension of said handle and engageable with the end of the bulb shank to yieldingly force the same into contact with said abutment.

2. A bulb stenciling device comprising a handle having an extended portion provided With a stencil block and with an abutment, Which latter is engageable With the bulb adjacent to its top, a spring-pressed clamp ing lever mounted on said handle'and engageable With the hold the same seated against said stencil block, and. a spring applied to the; extension of said handle and havinga head engageable with. the shank of the bulb and acting opposition to the spring pressed clamping' lever.

3. A bulb. stencilingdevice comprising a handle having an extended portion provided with a stencil block and With an abutment, which latter is engageable Withthe bulb adjacent to its top, a spring-pressed clamp.- ing lever mounted? on said handle and engageable with the shank of thebulb to, hold the same seated against said stencih block, and: a spring applied to the: extension of shank oi? the bulb: to

Which latter is engageable with the bulb adjacent to its top, a spring-pressed clamp.- ing lever mounted on said handle and engageable with the shank of the bulb to. hold the same seated against said stencil block,

a spring applied to: the extension of said handle and having a head engageable with V the shank of the bulbiand acting in opposition to. the spring-pressed clamping lever,

and another springapplied to, the extemion of said handlev and engageable with theend of the bulb shank to. press. the globe otsaid bulb into engagement; with said abutment.

In testimony whereof I aii'ni. my signature in. presence of two Witnesses.

@VERTON Vl liNSTO- rt. Witnesses:

CLARA. Dmmlins'r, B. G; WHEELER;

Copies of; this, patentmay. be- 013338111855 for: five cents each, by. addressing. the: "Commissioner of: Patents.

. r Washingto mD. 0. 

